Leopold Kronecker

Leopold Kronecker was a 19th-century German mathematician known for his work in number theory, algebra, and mathematical logic. He famously stated, "God made the integers; all else is the work of man," highlighting his belief in the foundational role of natural numbers in mathematics. Kronecker contributed to set theory and was one of the early figures to explore mathematical logic, arguing for a constructive approach to mathematics, where existence is tied to the ability to explicitly construct mathematical objects. His ideas influenced later developments in logic and the philosophy of mathematics.